<template>
  <el-container class="home-container">
    <!-- 头部区域 -->
    <el-header>
      <div>
        <img src="../assets/xiaofeixiang3.jpg" alt />
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!-- 页面主体区域 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse ? '64px' : '200px'">
        <!-- 侧边栏菜单区域 -->
        
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!-- 
            unique-opened	是否只保持一个子菜单的展开 
            collapse	是否水平折叠收起菜单
            collapse-transition	是否开启折叠动画
            router	是否使用 vue-router 的模式，启用该模式会在激活导航时以 index 作为 path 进行路由跳转
            default-active	当前激活菜单的 index
        -->
        <el-menu background-color="lightskyblue" text-color="#000000" active-text-color="#fff" 
        unique-opened :collapse="isCollapse" :collapse-transition="false" router :default-active="activePath">
          <!-- 一级菜单 -->
          <el-submenu :index="item.id + ''" v-for="item in menuList" :key="item.id">
            <!-- 一级菜单的模板区域 -->
            <template slot="title">
              <!-- 图标 -->
              <i :class="iconsObj[item.id]"></i>
              <!-- 文本 -->
              <span>{{item.authName}}</span>
            </template>
            <!-- 二级菜单 -->
            <el-menu-item :index="'/'+subItem.path" v-for="subItem in item.children" :key="subItem.id" 
            @click="saveNavState('/'+subItem.path)">
              <template slot="title">
                <!-- 图标 -->
                <i class="el-icon-menu"></i>
                <!-- 文本 -->
                <span>{{subItem.authName}}</span>
              </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 右侧内容主体 -->
      <el-main>
          <!-- 路由占位符 -->
          <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  data(){
    return {
        menuList:[],
        iconsObj:{
            '125':'iconfont icon-users',
            '103':'iconfont icon-tijikongjian',
            '101':'iconfont icon-shangpin',
            '102':'iconfont icon-danju',
            '145':'iconfont icon-baobiao'
        },
        //是否折叠
        isCollapse:false,
        //被激活的链接地址
        activePath:''
    }
  },
  created(){
    this.getMenuList()
    this.activePath=window.sessionStorage.getItem('activePath')
    
  },
  methods: {
    logout() {
      //清空 token
      window.sessionStorage.clear()
      //跳转到登录页面
      this.$router.push('/login')
    },
    async getMenuList(){
        const { data:res } = await this.$http.get('menus')
        // console.log(res)
        if(res.meta.status !== 200) return this.$message.error(res.meta.msg)
        this.menuList = res.data
    },
    //点击按钮，切换菜单的折叠与展开
    toggleCollapse(){
        this.isCollapse = !this.isCollapse
    },
    //保存链接的激活状态
    saveNavState(activePath){
        window.sessionStorage.setItem('activePath',activePath);
        this.activePath=activePath
    }
  }
}
</script>

<style lang="less" scoped>
.home-container {
  height: 100%;
}
.el-header {
  background-color: #ffcccc;
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  align-items: center;
  color: #fff;
  font-size: 20px;
  > div {
    display: flex;
    align-items: center;
    span {
      margin-left: 15px;
    }
  }
}
.el-aside {
  background-color: lightskyblue;
  .toggle-button{
      background-color:rgb(144, 221, 247);
      font-size: 10px;
      color: #fff;
      line-height: 24px;
      text-align: center;
      letter-spacing: 0.2em;
      cursor: pointer; /* 手表放上时显示小手 */
  }
  .el-menu{
      border-right: none;
  }
}
.el-main {
  background-color: antiquewhite;
}
.iconfont{
    margin-right: 10px;
}
</style>